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Heterotrophic and rhizospheric respiration in coniferous forest soils along a latitudinal gradient

Mäki, Mari ; Ryhti, Kira ; Fer, Istem ; Ťupek, Boris ; Vestin, Patrik LU orcid ; Roland, Marilyn ; Lehner, Irene LU ; Köster, Egle ; Lehtonen, Aleksi and Bäck, Jaana , et al. (2022) In Agricultural and Forest Meteorology 317.
Abstract
Northern forest soils are a major carbon (C) reservoir of global importance. To estimate how the C balance in these soils will change, the roles of tree roots and soil microbes in C balance should first be decoupled. This study determined how the activity of heterotrophs and tree roots together with root-associated microbes in the rhizosphere varies in coniferous forest soils in boreal, hemiboreal, and temperate climates along a latitudinal gradient using a trenching approach. We created experimental plots without living tree roots, measured soil respiration (CO2 efflux) from these and from unmanipulated plots using the chamber technique, and partitioned the efflux into root-rhizosphere (RR) and heterotrophic (RH) respiration. The share of... (More)
Northern forest soils are a major carbon (C) reservoir of global importance. To estimate how the C balance in these soils will change, the roles of tree roots and soil microbes in C balance should first be decoupled. This study determined how the activity of heterotrophs and tree roots together with root-associated microbes in the rhizosphere varies in coniferous forest soils in boreal, hemiboreal, and temperate climates along a latitudinal gradient using a trenching approach. We created experimental plots without living tree roots, measured soil respiration (CO2 efflux) from these and from unmanipulated plots using the chamber technique, and partitioned the efflux into root-rhizosphere (RR) and heterotrophic (RH) respiration. The share of RR in ecosystem gross
primary production (GPP) decreased from north to south in the Scots pine (Pinus sylvestris L.) and the Norway spruce (Picea abies (L.) Karst.) forests, with the exception of a mixed site, where the share of RR in GPP varied strongly between the years. RR per ground area and per root biomass were mainly independent of climate within the gradient. RH per ground area increased from north to south with temperature, while RH per soil C did not change with temperature. Soil moisture did not significantly affect the respiration components in the northernmost site, whereas soil moisture was positively connected with RH and negatively with RR in other Scots pine sites and positively connected with RR in pure Norway spruce stands. The dynamic ecosystem model LPJ-GUESS
was able to capture the seasonal dynamics of RH and RR at the sites, but overall accuracy varied markedly between the sites, as the model underestimated RH in the southern site and RR elsewhere. Our study provides knowledge about the nature of soil respiration components. The valuable insights can be used in more accurate land-ecosystem modelling of forest ecosystems. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Chamber measurements, Land-surface modelling, Soil carbon, Soil respiration, Trenching, CO2 efflux, Scots pine, Norway spruce, Forest soil, Carbon cycle
in
Agricultural and Forest Meteorology
volume
317
article number
108876
publisher
Elsevier
external identifiers
  • scopus:85125259976
ISSN
1873-2240
DOI
10.1016/j.agrformet.2022.108876
language
English
LU publication?
yes
id
a0db02cd-db8d-4b0d-adab-301a15cf7053
date added to LUP
2022-02-27 18:18:10
date last changed
2022-06-02 11:11:26
@article{a0db02cd-db8d-4b0d-adab-301a15cf7053,
  abstract     = {{Northern forest soils are a major carbon (C) reservoir of global importance. To estimate how the C balance in these soils will change, the roles of tree roots and soil microbes in C balance should first be decoupled. This study determined how the activity of heterotrophs and tree roots together with root-associated microbes in the rhizosphere varies in coniferous forest soils in boreal, hemiboreal, and temperate climates along a latitudinal gradient using a trenching approach. We created experimental plots without living tree roots, measured soil respiration (CO2 efflux) from these and from unmanipulated plots using the chamber technique, and partitioned the efflux into root-rhizosphere (RR) and heterotrophic (RH) respiration. The share of RR in ecosystem gross <br/>primary production (GPP) decreased from north to south in the Scots pine (Pinus sylvestris L.) and the Norway spruce (Picea abies (L.) Karst.) forests, with the exception of a mixed site, where the share of RR in GPP varied strongly between the years. RR per ground area and per root biomass were mainly independent of climate within the gradient. RH per ground area increased from north to south with temperature, while RH per soil C did not change with temperature. Soil moisture did not significantly affect the respiration components in the northernmost site, whereas soil moisture was positively connected with RH and negatively with RR in other Scots pine sites and positively connected with RR in pure Norway spruce stands. The dynamic ecosystem model LPJ-GUESS <br/>was able to capture the seasonal dynamics of RH and RR at the sites, but overall accuracy varied markedly between the sites, as the model underestimated RH in the southern site and RR elsewhere. Our study provides knowledge about the nature of soil respiration components. The valuable insights can be used in more accurate land-ecosystem modelling of forest ecosystems.}},
  author       = {{Mäki, Mari and Ryhti, Kira and Fer, Istem and Ťupek, Boris and Vestin, Patrik and Roland, Marilyn and Lehner, Irene and Köster, Egle and Lehtonen, Aleksi and Bäck, Jaana and Heinonsalo, Jussi and Pumpanen, Jukka and Kulmala, Liisa}},
  issn         = {{1873-2240}},
  keywords     = {{Chamber measurements; Land-surface modelling; Soil carbon; Soil respiration; Trenching; CO2 efflux; Scots pine; Norway spruce; Forest soil; Carbon cycle}},
  language     = {{eng}},
  month        = {{04}},
  publisher    = {{Elsevier}},
  series       = {{Agricultural and Forest Meteorology}},
  title        = {{Heterotrophic and rhizospheric respiration in coniferous forest soils along a latitudinal gradient}},
  url          = {{http://dx.doi.org/10.1016/j.agrformet.2022.108876}},
  doi          = {{10.1016/j.agrformet.2022.108876}},
  volume       = {{317}},
  year         = {{2022}},
}